A researcher conducts a two-sample t test comparing the mean sociability levels of 20 psychology majors and 15 chemistry majors. How many degrees of freedom are there for this test?
A) 1
B) 5
C) 33
D) 34

Question

Quizplus · Accepted Answer

The degrees of freedom for a two-sample t test is calculated as follows: df = (n1 -1) + (n2 -1) where n1 and n2 are the sample sizes. Substituting the values given in the question, we have df = (20-1) + (15-1) = 19 + 14 = 33. Therefore, the answer is C.

A Researcher Conducts a Two-Sample T Test Comparing the Mean